Revert ESP-MQTT (#508)

* Revert ESP-MQTT

* Revert ESP-MQTT

* Update sdkconfig.defaults

lib/espMqttClient/examples/simple-linux/platformio.ini

@@ -0,0 +1,29 @@
+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+;[platformio]
+;default_envs = esp8266
+
+[common]
+build_flags =
+  -D DEBUG_ESP_MQTT_CLIENT=1
+  -std=c++11
+  -pthread
+  -Wall
+  -Wextra
+  -Werror
+
+[env:native]
+platform = native
+build_flags =
+  ${common.build_flags}
+  -D EMC_RX_BUFFER_SIZE=1500
+build_type = debug
+lib_compat_mode  = off